Malicious PDF — malware analysis report

Static analysis result for SHA-256 4441529a895dda78…

MALICIOUS

PDF

86.8 KB Created: 2021-07-16 22:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0fd55e7e3c329db7ee99fe867fa479f1 SHA-1: d80185df36e5b6c8eb545853851de42ae0527593 SHA-256: 4441529a895dda786b1f978c10d38068a137621ad5682ce35abac608222f97d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16086766a825f9---80604182356.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c789222ba1---koladibutokola.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/lidewol.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db5cf5b4cc---60134812292.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/5cf0eaa6013bfaf95309205d70e108cb/27341062693.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/b9f099d429268536fbd33136e5c9064e/jusawigezusa.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16090c78bafd14---zuburodasaguzigofizir.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7c79433aa777418de1e2e41b6a4e9e4a/tonenuvu.pdf
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/ratokiruduzusivefim.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/be61bd9578e20c799fbade05e03c5e07/13914400064.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b837f567369---55345410790.pdf
    • http://cpgny.com/userfiles/files/20646586404.pdf
    • http://syuncyoku.jp/upload/file/zojexipubekurip.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a86d45b7f74---xabubeferi.pdf
    • http://koslita.eu/ckfinder/userfiles/files/roganososovivoxuk.pdf
    • http://tovicetour.com/FileData/ckfinder/files/20210603_C2E2346EE5F27376.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609219f27c413---59528603346.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/6im71d7u8c24t846st685edkj4/wunewebenusakinonola.pdf
    • http://dermaktif.com/imgup/file/28666702468.pdf
    • http://silverleafspa.ca/clients/10619/File/sefikugubapakezibudup.pdf
    • https://educhina.mn/editor/files/widubejonuruzigad.pdf
    • http://dgn89reunion.com/clients/862287/File/pusijepaku.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/0dqmguv3ke5d4kc2kuqqq06uc3/xevomikogawizidojenogi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ripening+of+fruits+is+hastened+by+using
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eddc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDC 16792 bytes
font_01_sfnt_off000105ee.bin
1da3c2630aa040e6531ef03084ff43c1f2bf27fa2c6e99dde8af5fd5f0eac191
pdf-font-stream PDF embedded font (sfnt) at offset 0x105EE 17800 bytes
font_02_sfnt_off00013461.bin
8e0a438beb8574524588b411f7499f34954a04492bd2faed16b01b9d4d5e7f32
pdf-font-stream PDF embedded font (sfnt) at offset 0x13461 11128 bytes